In 2019, Ripple and colleagues (2020) warned of untold suffering and declared a climate emergency together with more than 11,000 scientist signatories from 153 countries. They presented graphs of planetary vital signs indicating very troubling trends, along with little progress by humanity to address climate change. On the basis of these data and scientists’ moral obligation to “clearly warn humanity of any catastrophic threat,” they called for transformative change. Since the article's publication, more than 2,800 additional scientists have signed that declaration of a climate emergency (see supplemental file S1 for the current signatory list); in addition, 1,990 jurisdictions in 34 countries have now formally declared or recognized a climate emergency (figure 1p). But, at the same time, there has been an unprecedented surge in climate-related disasters since 2019, including devastating flooding in South America and Southeast Asia, record shattering heat waves and wildfires in Australia and the Western United States, an extraordinary Atlantic hurricane season, and devastating cyclones in Africa, South Asia, and the West Pacific (see supplemental file S2 for attribution information). There is also mounting evidence that we are nearing or have already crossed tipping points associated with critical parts of the Earth system, including the West Antarctic and Greenland ice sheets, warm-water coral reefs, and the Amazon rainforest (supplemental file S2). Given these alarming developments, we need short, frequent, and easily accessible updates on the climate emergency.

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世界科学家对 2021 年气候紧急情况的警告

2019 年，Ripple 及其同事（2020 年）警告了无法言说的苦难，并与来自 153 个国家/地区的 11,000 多名科学家签署人一起宣布了气候紧急情况。他们展示了行星生命体征图表，表明了非常令人不安的趋势，同时人类在应对气候变化方面进展甚微。基于这些数据和科学家“明确警告人类任何灾难性威胁”的道德义务，他们呼吁进行变革。自这篇文章发表以来，又有超过 2,800 名科学家签署了该气候紧急状态声明（当前签署人名单见补充文件 S1）；此外，34 个国家的 1,990 个司法管辖区现已正式宣布或承认气候紧急情况（图 1p)。但与此同时，自 2019 年以来，与气候相关的灾害史无前例地激增，包括南美洲和东南亚的毁灭性洪水、澳大利亚和美国西部创纪录的热浪和野火，以及非同寻常的大西洋飓风季节，以及非洲、南亚和西太平洋的毁灭性气旋（有关归属信息，请参阅补充文件 S2）。还有越来越多的证据表明，我们正在接近或已经越过与地球系统关键部分相关的临界点，包括南极西部和格陵兰冰盖、温水珊瑚礁和亚马逊雨林（补充文件 S2）。鉴于这些令人震惊的事态发展，我们需要关于气候紧急情况的简短、频繁且易于获取的更新。